title: Phase behaviour of the symmetric binary mixture from thermodynamic perturbation theory.
abstract: We study the phase behaviour of symmetric binary mixtures of hard core Yukawa (HCY) particles via thermodynamic perturbation theory (TPT). We show that all the topologies of phase diagram reported for the symmetric binary mixtures are correctly reproduced within the TPT approach. In a second step we use the capability of TPT to be straightforwardly extended to mixtures that are nonsymmetric in size. Starting from mixtures that belong to the different topologies of symmetric binary mixtures we investigate the effect on the phase behaviour when an asymmetry in the diameters of the two components is introduced. Interestingly, when the energy of interaction between unlike particles is weaker than the interaction between like particles, the propensity for the solution to demix is found to increase strongly with size asymmetry.
authors.affiliation: Institute of Theoretical Physics and Institut Romand de Recherche Numérique en Physique des Matériaux, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland. nicolas.dorsaz@a3.epfl.ch
authors.forename: N
authors.initials: N
authors.lastname: Dorsaz
authors.forename: G
authors.initials: G
authors.lastname: Foffi
mesh_terms: D000465:Algorithms; D006244:Hardness; D008422:Materials Testing; D015233:Models, Statistical; D010316:Particle Size; D010825:Physics / Q000379:methods*; D012996:Solutions; D013816:Thermodynamics
chemical_list: D012996:Solutions